Troubleshooting Using Troubleshooting Chart If you are experiencing a problem that is not listed in this chart, see your John Deere dealer for service. When you have checked all the possible causes listed and you are still experiencing the problem, see your John Deere dealer. Engine 112 If Check Engine Will Not Start · Brake not pushed down. · Brake not pushed down. · PTO switch in ON position. · Upper (switch) fuse blown. · Fuel pump fuse blown. · Spark plug wire(s) loose or disconnected. · Spark plug(s) not gapped correctly. Engine Is Hard to Start · Loose or corroded electrical connections. · Stale or dirty fuel. · Spark plug(s) is fouled. Check choke position. · Faulty spark plug(s).
· Spark plug(s) not gapped correctly. · Gummed or plugged fuel filter. Engine Stops When Brake Is Disengaged · Seat switch not engaged. · Seat switch disconnected or broken. Engine Misses Under Load · Faulty spark plug(s).